Hi Mike,
Your question is not clear to me, so here are three interpretations
even if it is a stretch compared to even what you indicated.
If you sorted the rows into a different order and want to restore
them you can restore the order if you previous numbered your
rows by placing a 1 on a new column (helper column) and
used the fill-handle to place 2 into next cell, and 3 into next, etc.
If you mean reordering the sheet tabs themselves into alphabetical
order.
http://www.mvps.org/dmcritchie/excel/buildtoc.htm#sortallsheets
This one is even further out. If you want to show the row number
you currently have then you can use the formula
=ROW()
or if you don't want it to match Excel's row number but that of the
data, something like =ROW()-1
What is unclear is what you mean by pages because you don't
see pages until the worksheet(s) is printed. Also by what you mean
by spread sheet (whether workbook, or worksheet).
If you are referring to the printing of pages coming out in reverse
order, some print drivers (not Excel) provide for printing in
reverse order, or odd then even pages, or Duplex (two-sided) printing.